I don't remember where I heard it, but I've heard when trying to work on a behavior where the dog get's overexcited/over-stimulated you shouldn't use toys/action rewards as it can make the dog keep getting overstimulated. Now that makes perfect sense to me, but is that true?

So for example, I'm working on Talon's need to chase (or at least try to) cars and bikes. Last few days we've made great progress using kibble as the reward, but I was stugn by a wasp for having kibble crumbs on my hand, and the bee's keep swarming us and the food bag. I've previously had serious allergic reactions to bee's (I don't know if wasp would be the same as a bee sting as far as allergies?) where I ended up in the ER. So I'm seriously skittish with this whole mess.

So, the kibble works great, we are making great progress but now I'm a bit too afraid to go out again with it. So, what is you opinion on using activity rewards for these kinds of behaviors? Have you had success? Does it make the dog over-stimulated? Does it help or hinder?